If you try to create a new discount rule in Magento 2, you'll see a condition called "Payment Method" there. This condition means that the discount will be applied in case a customer selects a certain payment method. But actually, this rule will not work due to a small omission in Magento 2 checkout. The module in the repo fixes the issue.
Run the following command from your Mangento root folder:
composer require magestyapps/magento2-fix-discount-rules
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Create folder 'app/code/MagestyApps/FixRules/' in you Magento setup
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Extract the repo files to the folder
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Open console (terminal)
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In the console (terminal) navigate to your magento root folder:
cd /path/to/your/magento -
Install the new module using the command below:
php bin/magento setup:upgrade
You can find some code explanations in our blog post: Cart Price Rules Based on Payment Method Don't Work
Some of code parts have been taken from our Payment Fees extension for Magento 2